feat(guides): Phase 2 — step editor, edit mode, collection management

Guide detail page:
- Edit mode toggle (✏ Bearbeiten / ✓ Fertig)
- StepEditorModal: 5 step types, title, markdown content, checkable toggle
- Per-step controls in edit mode: edit, delete, reorder ↑↓ (on hover)
- Section management: add / delete sections in edit mode
- Unsectioned + sectioned steps both editable
- Empty state with CTA to enter edit mode
- Guide delete with confirmation dialog
- Run history shows mode icon (📜 scroll / 🎯 focus)

Collections page:
- CollectionEditModal: emoji, color, path vs library type
- Create collection from empty state and header button
- Edit/delete existing collections

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.claude/plans/mana-guides.md

@@ -151,7 +151,15 @@ apps/guides/apps/web/src/routes/
 - [x] GuideEditModal
 - [x] Registrierung in mana-apps.ts + app-icons.ts
 
-### Phase 2 — Web-Import & Sharing
+### Phase 2 — Content-Editing ✅ Abgeschlossen
+- [x] StepEditorModal (Typ, Titel, Content, Checkable-Toggle)
+- [x] Guide-Detail Edit-Mode (Steps hinzufügen, bearbeiten, löschen, sortieren ↑↓)
+- [x] Abschnitt-Verwaltung im Edit-Mode (hinzufügen, löschen)
+- [x] Guide löschen (mit Bestätigungs-Dialog)
+- [x] CollectionEditModal (Emoji, Farbe, Typ path/library)
+- [x] Collections erstellen/bearbeiten aus Collections-View
+
+### Phase 3 — Web-Import & Sharing
 - [ ] Hono/Bun-Server (apps/guides/apps/server/)
 - [ ] Web-Import: URL → Guide via mana-search
 - [ ] Guide-Export: JSON / Markdown